My Dad used to talk about how they raised pigs back in the days of threshing machines. The fellow he worked for would make a wooden pen with a sort of a frame over it, and put the pigs in it. Then they would blow straw from the thresher in a big pile over top of it. They would feed and water the pigs through a hole in the top, and the pigs wouldn't come out until spring. They stayed warm and toasty all winter, and got grain and skim milk from the milk cows. (They used to ship the cream). He says that in the spring there would be the nicest fattest healthiest pigs you ever saw in that pile. I don't know if this was a general practice, or just something Dad's boss invented, but I do know he did it for years.
Pigs also don't like to go in trucks. My uncle had a trick where he would put a bucket over the pig's head, and the pig would back right up the ramp and into the truck.